Boil eggs. Remove from the heat and leave to stand, covered, for 8 minutes.
Rinse capers and soak in water for 10 minutes. Rinse again and chop.
Meanwhile, place the radish slices in a bowl, add 1 tsp oil and a pinch of
salt and pepper, and toss. Drain eggs and submerge in cold water for a few
minutes. Peel and chop